8. If the number of moles and volume of a gas are constant and the temperature o

Question

8. If the number of moles and volume of a gas are constant and the temperature of that gas is tripled, the pressure of the gas A) is doubled C) is quadrupled D) is halved E) remains the same n gas held in a 38.0 ml. flask at So F exerts a pressure of 43 torr. By using this information with the ideal gas law, it is possible to determine A. The mass of the gas in the container B. The identity of the gas in the container C. Nothing more about the gas. D. The molecular geometry of the gas in the container E. The number of molecules of the gas in the container. 10. There are S containers of the same volume under the same pressure if they content helium at 300 K, neon at 400K, nitrogen (Na) at 250 K, Hydrogen (Ha) at 350 K and carbon dioxide (CO:) at 200 K which of them has the greatest number of moles? B) Ne C) N D) H E) CO 11. When diluting a solution, which one is correet? A) The volume of solution decreases B) the concentration of solution increases C) the amount of solute remains the same D) the amount of solute gets lower E) the amount of solute increases 12. If the molar concentration of Potassium carbonate (K CO,) is 0.20 M, what is the concentration of potassium ion? A) 0.10 MM B) 0.30 M C)0.05 M D)0.20 M E) 0.40 M 13. When 0.05 moles of hydrochloric (HC1) acid is added to 0.15 moles of sodium hydroxide (NaOH) in a liter of solution the resulting solution will be B) basic A) acidic C) neutral D) It is impossible to tell from the information given E) Oxidized 14. What mass of lithium carbonate is required to prepare 1.0L of a 0.250 M Li CO (MM 73.9 g/mol) solution? A) 18.5g B) 24.6g C)37g D55.4g E) 73.9g 15. If 40 g of NaOH were used to prepare 250 mL of solution, what would the concentration be? a. IMb.4M c.2M d. 6 M e.3 M 16. Which one is not true regarding a solution? A. A solution can be in a solid phase B A solution is a homogeneous mixture of two pure substances. C. The solvent is the component present in the largest amount, D. The solute is present in the largest amount. E. It could contain more than one solute

Explanation / Answer

8) Pressure and Temperature have a direct relationship as determined by Gay-Lussac Law

P1/T1=P2/T2

Pressure and temperature will both increase or decrease simultaneously as long as the volume is held constant.

So, in this case the pressure of the gas also get tripled

9)   PV=nRT

a.    So, with this equation we come to know that if we know the pressure, volume and temperature of the gas we can determine the number of moles of the gas.

10)H2

11)The amount of solute remains the same

12)0.4 M

13)Basic, because 1 mole of HCl Is required to neutralize 1 mole of NaOH

14)A) 18.5

Molarity =no of moles / Volume

Here no of moles= weight in gm/ Gram molecular weight

15)b. 4M

16)The solute is present in largest amount

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